Lan Jaenicke garments are measured using traditional sizing S-XL. They measure the width of shoulder seams.

You can estimate your size best by following these guides:

Size

Details

1 S (Shoulder Width 14 1/4")
2 M (Shoulder Width 14 3/4")
3 L (Shoulder Width 15 1/4")
4 XL (Shoulder Width 15 3/4")